kernel: make MarkAllSubBagsDefault private, use in Julia GC #3842
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MarkAllSubBagsDefault is an implementation detail of GASMAN (and
now also Julia GC), and should not be used by client code ever. As such,
it seems sensible to hide its implementation.
Also update/remove/add some comments.
This PR conflicts with PR #3840, but resolving the clash should be trivial. I'll happily do it for this PR if PR #3840 gets merged first.